I have a Bushnell 4200 6-24X40 scope that I have been trying to mount. At first I bought Leupold PWR low rings 54144 1" rings. These were to small in diameter. Then I bought Leupold QRW 30mm low rings 49861. These are too big! So now I have two sets of rings, neither of which work with this scope. The diameter of the tube on the scope measures 1.006" OD. So instead of shimming, I'd just like to find the correct rings so I can mount this on my M25 with picatinny rail. Any suggestions?